Power-reverse gear



2 Sheets-Sheet. i

INVENTOR 15 M ATTORNEY;

Dec 6 M. H. RLGBERTS POWER REVERSE GEAR Filed July 6, 1925 By M Dec. F6, 3927. E 651 8 I i M. H. ROBERTS 38 POWER REVERSE GEAR Filed July 6. 1925 2 shuts-swag 2 I H if IN VEN TOR muz z A1. flM

W vMw ATTORNEY; 1

' typeshown m' my '35 in theaccompanying e 4-4 of Fi 2.

I Patented Dec. 6 19 27.

' nomaeun a. nonmrrs,

WAY surrmr comm, A CORPORATION or nnnawm.

or nnennwoon, NEW chaser, essreuoaro'rmxnnr rownB-mvnasn can.

Application measuly a, 1m semi iro. 41,597."-

This invention relates to fluid operated power reverse gears for locomotives such as shown in my Patent No.'1,500',685,- granted 'July 8, 1924. It is often necesary and l frequently desirable to operate the reverse gear manually for" example, when there 1s a failure of the air" "or other operat-.

. ing medium while on the road, in movement of the locomotive about the round house 10 when there is no air available .or in setting 'ghle valves of the locomotives when in the op. I

It isv the primaryobject of the present invention'to provide'a reverse gear, of the patent, which: can be easily operated by hand, without];-placingv undue strain on any of the parts and this mode of operation being the same either without undue exertion A further object of my invention 1s the valve gear in case theengine sh euld be op-v erated on the road without air pressure in the cylinder.

Another object is the provision of a valve 9 provision of means to prevent shock to the These together with such objects. as may" hereina er appear or are incident to my in vention Iobtam by means of aconstruction which I have illustrated in'preferred form drawings wherein F1 1 is a diagrammatic side elevation of a ocomotive equippedgjwith my improved Fig section of the rear i to POI't10n 0f l3hB r cylinder and associated an :11: Fi

we portion of the gear; and

Fig. 4: is a cross sectiontaken eferring to Fig. 1 it will be that I have-diagrammatically illustrated a port on ofa locomotive, the'reierence letterA- mdicating a power reverse gear; B operatwe the gear located in the ca; C connection d the mec I: B; and l) thefbe c on the line 3 is a. longitudinal section of thelfor ,tW' the-member operate the gear manually,'when it becomes 'ineans of the bearin having connectionrwith the verse ear thru the reach The gear shown in this instance in general comprlses a cylinder 6, a piston 7 having a plsto'n rod 8 adapted to be connected to thereach rod E, a walve casing, 9 for the. D.- valve 10, and an eggerating rod or shaft 111 havmg screw thr ed engagement with the P1ston7. I

The simple and novel arrangement of parts thru which 'I' am enabled to eflectively necessary or when desirableto'do so, will new be described, from which description 1t will becomeepparent that the advantages of manual 0 eration as-well as p'ress'ure'o eration' can e hadthru my invention, e '70 case, exce t that when manually operating pressure md isnot-supplied to t e' valve gear.

. The operating rod or shaft 11 is provided w1th an enlarged collar-like portion 12 havmg anti-friction bearings 13 at either Side thereof. upwardly. extendin ftongue like member 14 is carried onthe aft 11 by 131 which permits the shaft to be'rota withoutretating. the member 14, such member however'beingheld longitudinal-displacement with ect wa sllafli' the collar-like portion. 12. Hence it will M 1i) longitudinal movement eli haft causes'the member. 14 to moved, as will be the we in virtue er its connection with said member. The shaft 'is limited in its movementin either dim tion by the shoulders or 5% vided in the cylinder h cushioning" lama-1 absorbing any shoe ofv the valve Z. mightbe H-I". iir'r e uni shaft, thus preven pounding i th mber 14 a the steps 15 and w: the ear Y H operation of sure is: as 5 of the valve chitin device," cr m:-

ing now that a left hand thread is used (as shown in the drawmgs), and that the hand wheel is turned to the right, the shaft 11 moves rearwardly, the piston 7 acting as a fulcrum, carrying with it of course the valve '10 and completely uncovering the port 20 and admitingifluid pressure from the valve chest to the rear of the piston7, at the same time connecting the port 21 which communicates with the forward end of the cylinder with the exhaustport 22. Fluid pressure is supplied to the valve chest thru' the port 23.

The piston now moves forward carrying with it the shaft 11 and valve l0 bringing ity to neutral position covering both the ports 20 and 21 except for a slight bleed ofressure, and holding the piston in the seected position of cut-off. The mode Ofoperation for rearward positions is very similar in which case however the hand wheel is rotated to the left and the port 21 uncovered for admitting pressure to the forward end of the piston and the exhaust port 24 is connected withthe port 20.

If it is desired to manually operate the ear without the use of fluid "pressure, the

an wheel is turned as before' and the operation is as follows. Assuming the hand wheel to be turned to the right, the shaft 11 moves rearwardly as before until the stop 15 is engaged and then upon further rotation of the hand wheel the piston begins to move forward, the stop 15 acting as a fulcrum, such rotation being continued until the desired point of cut-off is reached. In order to reduce the friction when the gear is thus manually operated the anti-friction bearings 1313 are provided which are arranged to take the longitudinal thrusts in either direction. Hence it will be seen that the shaft 11 can be rotated without undue exertion and without undue strains on the operatin parts by reason of the friction on the shaft being reduced to a minimum. If desired the springs 18-18 may be of such tension that when the ear is manually operated they will act as yielding'abutments, in which case the longitudinal movement of the shaft 11 and member 14 would not be great enough to cause the member 14 to strike the abutments 15 and 16. I

Reverting now to the valve and valve chest arrangement it will be seen that the rearwardly extending portion of the cylinder head 17 constitutes a base for the valve chest and that a removable valve seat 25 is interposed between said base and the valve chest cap 26. By this arrangement I am enabled to conveniently machine, or regrind is uncovered over the shaft 11 for the insertion of the upper half of the tongue-like member 14.

The advantages of a gear constructed in accordance with my invention are many fold,

some of which have been pointed out in the foregoing and others will become apparent to those skilled in the art.

I claim:

1. In a power reverse gear, the combina- 2. In a power reverse gear, the combinaw tion of a cylinder, a piston, a pressure fluid controlling valve, a revoluble shaft operatively connected with said piston, a collar on said revoluble shaft, a valve operating member carried by said shaft having an annular recess for receiving said collar, an antifriction bearing lying to each side of said collar, said bearings engaging the collar and the edges of said recess, and abutments engageable by said member for limitin the longitudinal movement of the shaft in either direction, together with a spring lying to each side of the valve operati n member, said springs engagin said mem er at one eng and engaging a xed part at the other en 3. In a power reverse gear, the combination of a cylinder, a piston, a pressure fluid controlling valve, a revoluble shaft having screw threaded connection with said piston, .a collar on said revoluble shaft, a valve operating member carried by said shaft having an annular recess for receiving said collar,.an anti-friction bearing lying to each side of said collar, said bearings engagin the collar and the edges of said recess, an

abutments engageable by said member for 4 ated means for rotating the shaft.

4. In a power reverse'gear, the combination of a cylinder, 9, piston, a pressure fluid.

controlling valve, :1. revoluble' shaft operagaging the collar and the edges of said retively connected with said piston, a collar cess, and abutments engageab e-by said memon said revoluble shaft, a longitudinal split her for limiting the longitudinal movement 10 valve operating member carried by said of the shaft in either direction. shaft having an annular recess for receiving In testimony whereof, I have hereunto said collar, an antifriction bearing lying to signed my name.

each side of said collar, said bearings en- MONTAGUE H. ROBERTS. 

